Fluid-pressure brake



May 26,` 1925. r 1,538,926`

. C. P. CASS FLUID PRESSURE BRAKE Filed March 2l. 19123 Lil lNVIENTORCHRISTOPHER F.' CASS BY Qf. www? ATTORNEYv Patented May 26, 1925.

UNITED STATES 1,538,926 PATENT OFFICE.

CHRISTOPHER I. CASS, OF BERKELEY, CALIFORNIA,l ASSIGNOR TO THE WESTING-HOUSE AIR BRAKE COMPANY, OF WILMERDING, PENNSYLVANIA, A CORPORA- TION OFPENNSYLVANIA.

FLUID-PRESSURE BRAKE.

Application nieanarch 21, 192s. serial No. 626,672.

T all 107mm, it may concern:

Be it known that I, CHRISTOPHER P. CASS, a citizen ot' the UnitedStates, residing at Berkeley, in the county of Alameda and 6 State ofCalifornia, have invented new and useful Improvements in Fluid-PressureBrakes, ot' which the following is a specili cation.

This invention relates to fluid pressure brakes, and more particularlyto a fluid pressure brake for an automotive vehicle. The principalobject of my invent-ion is to provide an improved quick application andrelease valve device for controlling` the quick supply oi' fluid underpressure to and its 4release from the brake cylinder or brake chamber.

In the accompanying drawing, the single` figure is a diagrammatic viewof a fluid pressure brake equipment embodying my invention.

As shown in the drawing, the fluid pressure brake equipment may compriseabrake valve device 1, a reservoir 2 containing fluid under pressure, abrake chamber 3, and a quick applicationand release valve device f1.

According to my invention, the quick application and release valvedevice 4 may comprise casing sections 5 and G and a pair of flexiblediaphragms 7 and 8. Said diaphragms are spaced apart by means of aspacing ring` 9 and the parts are assembled with the casing sections 5and 6 clamped on the outer opposite sides of the diaphragms.

The diaphragm chambers 10 and 11 are connected to gether by a passage 12and diaphragm chamber 11 is connected by pipe 13 to the brake chamber 3.A plug lll is screwed into the central portion ot' the casing sectionand extends into the chamber 11 so that the upper :tace is in closeproximity to thediaphragm 8 andan atmospheric exhaust port 15 isprovided through said plug. A valve chamber 16 is provided in the casingsection 5 and said chamber is connected by pipe 17 to the reservoir 2.Contained in said valve chamber is a valve 18 having a stem 19 adaptedto engage the diaphragm 7. The chamber 2O between the diaphragms 7 and 8is connected by pipe 21 to the brake valve device 1.

In operation, the parts of the quick appli Cab cation and release valvedevice l are in the positions shown in the drawing when the brake valvedevice is in release position and there is no fluid pressure inchamberQO. In this position, the diaphragm 8 is free from engagementwith the seating face or plug 14, so that the brake chamber 3 is nowopen to the atmosphere by way of chamber 60 1l and the exhaust port 15.

If it is desired to apply the brakes, the brake valve device. 1- isturned to application position, in which fluid under pressure .issupplied through pipe 21 to'chamber 20. 65 The diaphragms 7 and 8 arethen moved outwardly by fluid pressure in chamber 2l) so that thediaphragm 8 seats on the top of plug 14 closing oli' the exhaust port 15from the brake chamber 3, while diaphragm 7 70 acts on the stem 19 tolift the valve 18 from its seat, so that Huid under pressure is suppliedrom the reservoir 2 through pipe 174 to valve chamber 16 and thenceflows past the open valve 18 to diaphragm chamber 10. 75 From chamber 10fluid flows through passage 12 to chamber 11 and thence throu h pipe 13to the brake chamber 3, so that tie brakes are applied.

The brakes may `be released by turnine the brake valve to releaseposition, in which Huid is' exhausted from chamber Q0, so that thediaphragms 7 and 8 move to release position, permitting the valve 18 toseat, and opening the exhaust port 15 to the brake 8.3 chamber 3.

Having now described my invention, what I claim as new and desire tosecure by Let tersPatent, is

1. The combination with a brake cham- 9U ber, ot' a valve forcontrolling the supply ol fluid under pressure to said chamber, aliexible diaphragm for operating said valve, a flexible diaphragm forcontrolling a port through which fluid is exhausted from said chamber, achamber intermediate said diaphragms, said diaphragms-being operated byan increase in pressurein said diaphragm chamber for opening said supplyvalve and for closing -said exhaust valve, and nmeans '100 forcontrolling the fluid pressure in said diaphragm chamber.

2. The combination with a brake chamy ber, of a casing containing twospaced flexible diaphragms forming three chambers,

Itwo of said chambers being connected to each other and to the `brakechamber, a valve operated by one diaphragm for supplying fluid underpressure to one of said connected chambers and thence to saidbrakechamber, an exhaust port controlled by the other diaphragm, throughwhich fluid is released from the other connected chamber and thence fromthe brake chamber, and

means for supplying fluid under pressure to the third diaphragm chamberto operate said daphragms to open said supply valve and close saidexhaust port. 10

In testimony whereof I have hereunto set my hand.

CHRISTOPHER P. CASS.

